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The dial on the face of a chronograph used to measure the speed in kilometres/metres per hour (and not miles). On the majority of the Swatch Chrono models, the tachometric scale on the dials (bezel) allows the reading of a speed measurement, directly in kilometre per hour (Km/h).The speed measurement must be carried out inside a time interval of maximum 60 seconds for distances of 10, 100 or 1000 meters.For a measurement on 1000 meters, the figure read on the tachometric scale corresponds directly to the speed in km/h.For a measurement on 100 meters, the figure read on the tachometric scale must be divided by 10 to obtain the speed in km/h.For a measurement on 10 meters, the figure read on the tachometric scale must be divided by 100 to obtain the speed in km/h.